To gain influence with Kreia, you had to accept her "lessons", which meant you had to agree with her cynicism, even when playing lightside. To gain influence with G0-T0, you had to get him early in the game, and then take him on a lot of missions, even though he was fairly useless in combat and had blackmailed his way into your party. If you didn't get enough influence with him, you'd never understand what that stuff on Nar Shadaa was all about.